Toshiba 2000 V Series Manual

Also see for 2000 V Series: User manual

38 model 2000 DeviceNet Module Manual (DN611/DN611A)Chapter 3 Preparations for Operation (Hardware)3(2) How to determine the most appropriate arrangement of network power unitsFollow the procedures below to determine the most appropriate arrangement ofnetwork power units.(a) Total the network currents consumed by the individual nodes on the network. Forthe nodes operating on the network power, use the sum of both currents.(b) Measure the overall length of the network.(c) Based on the cable type (thick cable, thin cable) used for the trunk line and theoverall length of the network measured in Step b) above, obtain the maximumcurrent that can be supplied to the cables, referring to Figure 3-9 and Figure 3-10.(d) When the total current consumed by the network (obtained in Step a) is smallerthan the maximum current that can be supplied to the cables (obtained in Step c),the network power unit installed at the network end can be used to supply thepower to all the nodes (Single power unit terminal connection).(e) When the total current consumed by the network (obtained in Step a) is greaterthan the maximum current that can be supplied to the cables (obtained in Step c),install a network power unit near the center of the network and check whether itcan supply the power to all the nodes (Single power unit central connection).(f) If the single power central connection is insufficient to supply the network powerto all the nodes, install additional network power units.(3) Single Power Unit Terminal ConnectionShown below is an example of configuration where a network power unit is installed atthe end of a trunk line (thick cable) 200 meters in overall length. The currentconsumption of each node is shown in the figure below.Figure 3-11 Example of Single Power Terminal Connectionネットワーク電源供給装置Node 1Node 1Node 1Node 1Node 1電源タップ200 mV +−V − 0.1A 0.15A 0.05A 0.25A 0.1Aa) 合計消費電流＝0.1A + 0.15A + 0.05A + 0.25A + 0.1A ＝ 0.65Ab) 電源供給の総延長＝ 200ｍc) 図 3.10 からケーブルに流せる最大電流＝ 1.53Ad) 合計消費電流＜最大電流なので、単一電源終端接続で全ノードに電源を供給できるe) ネットワーク電源供給装置は定格電流が 0.65A 以上のものを使用(使用条件等を考慮して、十分余裕のあるものを選定する)Power tapNetwork powersupply unita) Total current consumption = 0.1A+0.15A+0.05A+0.25A+0.1A=0.65Ab) Overall power cable length = 200mc) Maximum current that can be supplied to the cables based on figure 3.10 = 1.53Ad) Since the total current consumption is smaller than the maximum current,power can be supplied to all the nodes by single power unit terminal connection.e) Install a network power unit with a rated current capacity of 0.65 A or more.(Select one with an adequate capacity, considering the conditions of use.)